This seems to be an issue posted couple of years ago but didn't find a solution. Apologies for my restricted car knowledge but keen to learn.
Basically, I used to press the MAX button on my heating control unit and hot air used to blow within 10 seconds. Now, no matter what temp the car is set to, even at 30 degrees the car still blows cold air even after the car has been driving for hours.
I've been told by Halfords that it's the "flap" which sounds right as when I used to turn the heating on there was a clear recognisable sound like a flap closing after 2 seconds and then the car would blow hot air in seconds. Now there is no such noise when I turn the heating on. He said along the lines the flap should close and blow hot air and open for cold air. At the moment its not closing?
I've been told by one mechanic that I should just change the entire heating unit or something along those lines. If it is this "flap", which parts would I require to order?
Thanks for looking!